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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6944842a1e584764647fe5f9f0f3163051525c166ad85d350ffe80206a1e1461' 
  AND token = 'ASrJtwKf3THUr+zik5h0t6bbw2EJ5ZLtSM4oWFGlT8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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