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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0c84882bc1e85c9026da67b2186bf96963b74764867e9b704ff54a3f431bfd6' 
  AND token = '/COgeADnrqu+ZxT2ghElQU6rrEX472T3iiSVMFPPfFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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