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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f833e29233c54c22e288ee606418709ed902963097b6a85261f432bdbaea335d' 
  AND token = 'jTScxAcBsLlit2vzTMBH+DYk6ewen0dbFvsFxrY39gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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