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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59c818666b13524fd431e6caaf85dabc4d6b1add4546c6aa0ac44453e2145140' 
  AND token = 'hQmRNZwkV0OGsADyEm1KE3pLhTyHGXa80ZtCqWluIdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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