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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf682e3dd69840df95eacb51d36b1c4aef6fe8ffa6b0cfdee7f015bcd65f32be' 
  AND token = 'TRYdIS+5m8ncyAdZWtkQT74sS1SfVkUBNniFqGob3+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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