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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcfe596db5ea4fd2d50cd79f382696e393d589012d513513ab905e55248c3180' 
  AND token = 'kngfgrvy7TeBXLLZMTkr4tvvH14wzAyJiZ54VcOR2ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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