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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2601185d5dec868b0d4fce6923d711b22df5782ce1ddae09cf9222ab1541ca7' 
  AND token = 'U8opA75NQHl4dD/kxZm2ERwS2mD3xJWmTRXc/vtoHjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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