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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4de11b99bdf72da8fbee0f170d5df585a01e1e13523f58604c17603f20b16ec9' 
  AND token = 'izjV99blJZTi1fsq0oee1CD5RgQ2UzrQX1JdVo0fqBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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