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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2155ecf7e4bec12bc73469d09e28a88a7338ccb87809cef325e9bb4bb1f0b2c5' 
  AND token = '2QfvM3Mm+sljXZ8eNE8HXcRIv5y1IRTy9wcUjCK0K+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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