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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89d28663b06c7b21b26354b341425bd523518e2d35a60d7fdadda0e18bb5c759' 
  AND token = 'v6LG91abzDjWauU98fkrmhgRA/REZAOr1GTbRIq1sP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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