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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd748cbc01d55de3425dea83b635c2ab9c2e144dd700ae21ebdfe34289d34d1cb' 
  AND token = 'ZAdlCePNoIC6dHIWGKtrV2sePzbd9N/cmzPwJkb3Q5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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