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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4630389ae0e8ccd0b410093694317344fbf4dcbfa562d717bbc7ccb3302263cd' 
  AND token = 'Q8Gp0UWd8hfHlYHw/+m/MySaEfdi6OFzr8hdua06OPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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