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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2755eea40a4e4bce42060d81759c0a922f33941e68d96ce9bc65fec7d5941273' 
  AND token = 'VDSp5yN6ZnRVQWnRtIDnQAaoib1PMDe5z7BpSTE4Dz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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