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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b3040b2dfbb4f362dfa6f9b6b8da6e5c7822620d08bbbcb0be4e670daade665' 
  AND token = 'jNpvlDFsOP4HrEu+8PPMySL+ropkAk7MBmngR4GzY+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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