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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ceb4328fda6baf84cbff798f688a7c57869dec3885c0815ae4d10d6c6f4541b' 
  AND token = 'WhD1SHvrfIO8E07LTuJK7maNDsr8u7R/sveIrHcogPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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