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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe55d40430f36ca38e3cda6bb6318100bd3010272d355d267a68a23a0f2b9e72' 
  AND token = 'd4NTs0uVam+6Vb6qqWKPvPcQbio4zq7kxASpolFEdes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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