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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa2989783ee5f3ae6c68422ec9f0aeda3d1829ab2e27f76e5980071cb38291c9' 
  AND token = 'isWbRT32w5QqSlbYInkn0QtOSZ38uHMp0f0AXleaLBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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