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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc5bd3e8629d91d5d4efd95cca382dca9d6b6d10b3b0e09912689a6ba9b674e8' 
  AND token = 'AyEfvKmDdaAmdwBVx3NDu5cjzQyOxaW8D+184+l21og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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