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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2c7acaa82feb24bf1b1e36f2c05db346c99a9a427b9776d741b73395bbf48de' 
  AND token = '9nkHLoBLLEuLdQXL3FphvFjZEr4A+a86ARF93NrjV9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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