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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5215042084c3615b1fcdafff2fbe48d55da80d5047446ded8cc768318adc6c6a' 
  AND token = 'LQtBwaszeoBq2d13kU5RMKzXMwZX6X/0AoaNh1UycZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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