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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aabb950bd250247202e3bcf0b3b510a9418b02312a9e89028d507ee43687c7b7' 
  AND token = '9ay1qp62AbjUkdefIpXxk1sCSeDfN9jNU/YxzLhwhKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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