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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b485cccebd66e736494b61db234867b5253a7bda0efb614325d705cefceb886' 
  AND token = 'DmNxs8h8cnYzyf4s1Si3pNWWW0aKJuShs7Q0iwTb6OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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