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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b19a6f7daf8b1510c24b0a177db9f2f5636a1eb40acaa73a7974e9d3e098150e' 
  AND token = 'xl8cS9Jupogxn2OWzcpmjuAeG3QtTtK7xR17Uff7Ojs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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