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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1151e29ff6a8d73144d336dec1cdabcdd6cf57f2a97f18744ffef4bdc886535d' 
  AND token = 'RpbiyajIXLyGaiYT/pSF1SlcBMIgKysBPc3GbKRSbvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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