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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a75703bec223cc7cb7e2716f8d2185b7d3eaa5fef6c92253838e3e8f61e68fd0' 
  AND token = 'xMpsNT2XXaDgbIuGcZWh6JL5vA3FHcl0+k8Gx1ZA2ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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