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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbfa71d7b696165b9048092a7d73e0c25118c42adebeb5b558c04ecc4cbc4b00' 
  AND token = 'UV/ZBEcrRaKz65+aTiVFdv1JKgZJldIEoziI4WyHYm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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