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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '442cf1a30d4675a59779f7b925ff6e3e2e7cc837e5f413ea79bbd191e0b5f786' 
  AND token = 'i2zgyXi655Kt4RBItrNthaU8uPKb+jjzAKx8r4NQiKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}