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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03d3591bd1bf26b648463988074cfd4962ced0bb24ede5cda0972437d7224628' 
  AND token = 'DYa1/bVy2RYn5R9zhzGmTvEK201w41js4Aa8X29eSBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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