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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef321c2f341ccda0916d8c94c7f6cf8377460956e75716a79dd59e0cf94944d2' 
  AND token = 'P2CThTQfOPIHTOQktbARd6hvQy4LJ7SqxPCk9JPG4ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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