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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81b0d75cfa382861b191a6c0197b5708a267669303067ef26d532d21465239fe' 
  AND token = 'OmH0cR3bK2xKU5+YLUST3x+OU697RIXI93wpVHBrCfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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