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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2fb5962032b5718da59354afa48769360517e357ad5075e2c3673380dd80aee' 
  AND token = 's/76tWKhSm2oZRKkPMPbVF9Fr9C12kkbD3E2WStHq0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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