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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a20d886b2ba1b2db1db460f6c47b4067115c1173aca0b6b1bc9cac66bf2027f' 
  AND token = 'usTA33TG1rm52Seesyr5BqX997aMYVeiTOpzr3z2NnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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