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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b28d0f50b24e840e77b587aea566e4de41739fdf35be6ebafb57b9358702e86' 
  AND token = 'jV0jQS0R5Mkiim/0B+O6lV38Qq37lgAqa0Ey79j7H2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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