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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf0e77dc40fcd076fa7a6fad05bd9bb2859d5fb710e664a9764e933f0a86a1a0' 
  AND token = 'ug+h37vPEYw2xIe1fg3P1Sa41v6mF2wS/OSvSUncT34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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