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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '385f50a6b76e5033a89b76abdb96bf6abe406713bee1f071f2706fad04b56a37' 
  AND token = 'RmeCz+R6SIRhfe1Tm701c7aUa0frQuccfFHmzcwVZDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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