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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c094da8ee6fd96dd292e3035759322924650cf59b2cc0f5b66504a6b688b3149' 
  AND token = 'Bohva1Ygtw9tAiD42eaG1q21HjQNUdFy13IdpVe/flg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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