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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb13db98b0b049b7a3aaf2e5b0064bf99b5454e033e1e03c89c1314ee466eb54' 
  AND token = 'tDsMXMxespQjy/bw33wDNAGGcYPEorGnAbaS59SkOnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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