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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ce0a7013934eb92abe326c198ce965f2d5d7bc47cb428ede29fc00af6d2cfca' 
  AND token = 'T94Py3o4ZXl1n4X0a0Jz/mu5+jEJN7mvCLOyIdHLR80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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