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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c6c2a31326e1d6c468a1b09c94a0436e6d3bca7f70402500d103d2081c65fc3' 
  AND token = 'ewgBITIEKDVlCdgBYkoYFNmb9FGs59GdHgOnB18mkkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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