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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8b073d2f9acb7cf2f50e871d15177c061c0759f2281bd14550fd2689bcb58a0' 
  AND token = 'N3le7xhSE4khcbTL5j7QC7XrEfotQ5XeIDj1e/e929c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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