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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '779ccf91b4aac76afc1299f6263a23c1b1d795207643320609817c3b07509c28' 
  AND token = 'dYTF/YTNXAP3Vmm87PNzvXan45930piy3HDFqwxZLPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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